?? stringkey.java
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package org.apache.torque.om;/* * Copyright 2001-2004 The Apache Software Foundation. * * Licensed under the Apache License, Version 2.0 (the "License") * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *//** * This class can be used as an ObjectKey to uniquely identify an * object within an application where the id consists * of a single entity such a GUID or the value of a db row's primary key. * * @author <a href="mailto:jmcnally@apache.org">John McNally</a> * @version $Id: StringKey.java,v 1.9 2005/01/31 19:43:56 tfischer Exp $ */public class StringKey extends SimpleKey{ /** * Creates an SimpleKey whose internal representation will be * set later, through a set method */ public StringKey() { } /** * Creates a StringKey whose internal representation is a String * * @param key the key value */ public StringKey(String key) { this.key = key; } /** * Creates a StringKey that is equivalent to key. * * @param key the key value */ public StringKey(StringKey key) { if (key != null) { this.key = key.getValue(); } else { this.key = null; } } /** * Sets the internal representation to a String * * @param key the key value */ public void setValue(String key) { this.key = key; } /** * Sets the internal representation to the same object used by key. * * @param key the key value */ public void setValue(StringKey key) { if (key != null) { this.key = key.getValue(); } else { this.key = null; } } /** * Access the underlying String object. * * @return a <code>String</code> value */ public String getString() { return (String) key; } /** * keyObj is equal to this StringKey if keyObj is a StringKey or String * that contains the same information this key contains. Two ObjectKeys * that both contain null values are not considered equal. * * @param keyObj the comparison value * @return whether the two objects are equal */ public boolean equals(Object keyObj) { boolean isEqual = false; if (key != null) { if (keyObj instanceof String) { isEqual = keyObj.equals(key); } // check against a StringKey. Two keys are equal, if their // internal keys equivalent. else if (keyObj instanceof StringKey) { Object obj = ((StringKey) keyObj).getValue(); isEqual = key.equals(obj); } } return isEqual; } /** * get a String representation * * @return a String representation of an empty String if the value is null */ public String toString() { if (key != null) { return (String) key; } return ""; }}
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